Choi Hyun Seok, Kang Sun Yool, Cho Seong Jun, Oh Inn-Yeal, Shin Mincheol, Park Hyuncheol, Jang Chaun, Min Byoung-Chul, Kim Sang-Il, Park Seung-Young, Park Chul Soon
Department of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea.
Center for Spintronics Research, Korea Institute of Science and Technology, Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 136-791, Korea.
Sci Rep. 2014 Jun 30;4:5486. doi: 10.1038/srep05486.
Spin-torque nano-oscillators (STNOs) have outstanding advantages of a high degree of compactness, high-frequency tunability, and good compatibility with the standard complementary metal-oxide-semiconductor process, which offer prospects for future wireless communication. There have as yet been no reports on wireless communication using STNOs, since the STNOs also have notable disadvantages such as lower output power and poorer spectral purity in comparison with those of LC voltage-controlled oscillators. Here we show that wireless communication is achieved by a proper choice of modulation scheme despite these drawbacks of STNOs. By adopting direct binary amplitude shift keying modulation and non-coherent demodulation, we demonstrate STNO-based wireless communication with 200-kbps data rate at a distance of 1 m between transmitter and receiver. It is shown, from the analysis of STNO noise, that the maximum data rate can be extended up to 1.48 Gbps with 1-ns turn-on time. For the fabricated STNO, the maximum data rate is 5 Mbps which is limited by the rise time measured in the total system. The result will provide a viable route to real microwave application of STNOs.
自旋扭矩纳米振荡器（STNO）具有高度紧凑、高频可调谐以及与标准互补金属氧化物半导体工艺良好兼容性等突出优点，为未来无线通信提供了前景。由于与LC压控振荡器相比，STNO还存在输出功率较低和频谱纯度较差等显著缺点，因此尚未有关于使用STNO进行无线通信的报道。在此我们表明，尽管STNO存在这些缺点，但通过适当选择调制方案仍可实现无线通信。通过采用直接二进制振幅键控调制和非相干解调，我们展示了在发射机和接收机之间距离为1 m时基于STNO的无线通信，数据速率为200 kbps。从对STNO噪声的分析可知，开启时间为1 ns时，最大数据速率可扩展至1.48 Gbps。对于制造的STNO，最大数据速率为5 Mbps，这受到整个系统中测量的上升时间的限制。该结果将为STNO在实际微波应用中提供一条可行的途径。
